B&M 20400 Tork Master 2000 Torque Converter Replaces stock converter for better launch capability and more strength Value priced upgrade for mild performance applications and street rods Stall speed of 1900-2100 RPM (based on an engine producing 230 lb. ft. of torque at 2500 RPM) High quality remanufactured unit features a new precision pump drive tube Backed by the manufacturer with a 1 year limited warranty Bolt Circle Diameter - 10.75 INCHES